Bobbin



Patented Aprr 28, 1936 UNT'ED f STATES PATENT F'FICE 1 Claim.

My invention relates to an improvement in bobbins of the general character described in United States Patent No. 1,834,914 of December 1, 1931, and it relates more particularly to the provision of means in the butt of the bobbin where it engages the spindle to effect firmer engagement between the bobbin and the spindle, in order to insure positive turning of the bobbin with the spindle, particularly on the starting and stopping thereof, and further to prevent the bobbin from rising with respect to the spindle due to centrifugal force resulting from the rapid rotation of the bobbin and the spindle.

My invention still further relates to simple, novel means for effecting this purpose without adding to the cost of manufacture or assembly. In the accompanying drawing:

Fig. 1 represents a fragmentary vertical section of a bobbin and spindle.

Fig. 2 represents a section on line 2-2 of Fig. 1.

Fig. 3 represents a section on line 3-3 of Fig. 1.

Fig. 4 represents a perspective view of a bushing embodying my invention.

Fig. 5 represents a vertical sectional view of the bushing shown in Fig. 4.

Fig. 6 represents a fragmentary sectional View showing a modied form of bushing.

Referring to the drawing in which like reference characters indicate like parts, I designates the blade of the spindle to which is rigidly secured the whirl 2. The extension 3 of the whirl 2 is provided with a recess 4 which is covered by a cap 5, the upper recess of which forms a seat of the bobbin 6. The spindle is provided with a plurality of symmetrical, evenly spaced clutch members 8 which fulcrum at 9 against the blade I and which are provided with the bottom feet I 0 4which are tensioned by the spring I2. The upper ends of the clutch members 8 are retained by the pendant sleeve I4. The structure so far described is conventional and forms no part of the present invention.

The bobbin 6 is provided with the enlarged hollow1 bottom portion I6 which is adapted to seat on top of the cap 5 and which is intended to engage the clutch members 8. Usually, in order to minimize wear, a cylindrical metal bushing is driven upwardly into the hollow bottom of the bobbin, said bushing forming a shield between the bobbin and the clutch members 8 and engaging the latter. According to my invention I utilize a bushing of the particular formation illustrated in Figs. 4 and 5, in which the bushing is provided with the substantially cylindrical body portion I8 and the lower outwardly flared flange I 9 which engages the corresponding seat on the bottom edge of the bobbin as shown at 20. 'I'he upper .portion 22 of the bushing is enlarged to a diameter greater than the diameter of the cylindrical portion I8 and is adapted to engage a 5 corresponding enlargement 23 in the upper reaches of the hollow bottom of the bobbin. 'Ihe cylindrical portion I8 is adapted for a tight t and the upper enlarged portion 22 is adapted frictionally to engage the upper portions of the outwardly flaring clutch members 8, it being understood that the bushing is initially straight or vcylindrical when rst inserted into the bottom of the bobbin and that it is subsequently spun to produce the enlargement 22 to the size of the corresponding enlargement 23 in the bottom of the bobbin. After the bushing has been put in place and enlarged as stated the holes 24 are struck therethrough, thus fastening or embedding the bushing rmly into the inner wall of the bobbin, thus preventing the loose turning of the bobbin or the bushing with respect to each other. I have found in practice that the enlargement 23 of the bore in the bottom portion I6 of the bobbin 6 with the corresponding enlargement of the upper portion 22 of the bushing forms a seat for engagement of the upper outwardly flaring portions of the clutch members 8, thereby aiording sufficient frictional engagement to insure the turning of the bobbin with the spindle and preventing the rise of the bobbin with respect to the spindle due to centrifugal force resulting from high speed rotation. While the frictional engagement thus secured is suicient for the purposes enumerated, it is at the same time not so fast as to render the removing of the bobbin from the spindle unduly diliicult, particularly in view of the fact that the bobbin, when ready to be removed, is almost all covered with yarn which must not be touched, so that the bobbin has to be removed by grasping only the upper tip thereof. It will be understood that the centrifugal force acting on the clutch members 8 tends to throw the upper portions of said clutch members out radially into the enlarged area 22 of the bushing, thus not only affording sucient friction to insure the turning of the bobbin with the spindle but also preventing the rise of the bobbin with respect to the spindle due to the engagement of the restricted portion 25 of the bushing with the corresponding portion of the clutch members when the latter are deflected outwardly into the pocket 22.

In Fig. 6 I have shown a modified form of bushing which instead of stopping with the outwardly engages the bottom of the bobbn and the vertical annular portion 29 which engages the lower outer Vertical Wallsof the bobbin, the upper edgeV 30 of the vertical portion 29 being preferably embedded into the body of the bobbin, as shown V'in Fig. 6. In this way my novel bushing is also made to serve as a shield for protecting the lower 10 portion of the bobbin.

I claim:

A bobbin having the lower portion thereof adapted to fit over a spindle and having a cylindrical bore formed therein, substantially the'lower half of said cylindrical bore being of a smaller diameter than the upper half thereof, and a bushing inserted Within the bore of said bobbin and conforming to the smaller and larger diameters of -said opening.

' CLARENCE E. CUNDEY. 

